Question: 6. Protons, after being accelerated through a potential difference of 2000 volts, enter a uniform magnetic field of 5000 gauss perpendicular to their path.

6. Protons, after being accelerated through a potential difference of 2000 volts,

6. Protons, after being accelerated through a potential difference of 2000 volts, enter a uniform magnetic field of 5000 gauss perpendicular to their path. Following a circular path of radius R in the magnetic field, the protons im- pinge on a photographic plate. If now a beam of doubly ionized helium atoms is used and (a) keeping the electric field fixed, what should be the value of the magnetic field in order to receive the helium ions on the same spot as in the case of the protons? (b) keeping the magnetic field fixed, what should be the value of the electric field in order to receive the helium ions on the same spot?

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